#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
	int n = 0;
	while (scanf("%d ", &n) != EOF)
	{
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < n; j++)
			{
				if (i == 0 || i == n - 1 || j == n - 1 || j == 0)
					printf("* ");
				else
					printf("  ");
			}
			printf("\n");
		}

	}
	return 0;
}